John <[email protected]> wrote:

> > There are better systems that have a pure honeypot which actually
> > accepts mail (and add the IPs that send mail to a blacklist)
>
> OK - where do we find one of THOSE?

Unfortunately, THOSE may be a bit too simplistic :(

Someone forges an email appearing to come from one of your honeypot
addresses, and sends it to a bogus (or on-vacation) address at a
legitimate site.  The bounce (or vacation response) comes to your
honeypot address, causing you to blacklist the legitimate site.

No, I am not making this up.  More than once I've discovered one of
my employer's mail servers on the Spamcop blacklist, causing my home
upstream to bounce (as presumed spam) messages I tried to send from
office to home.  This seemed to have been the mechanism involved.
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